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Differential phase-contrast imaging with increased dynamic range

a technology of dynamic range and imaging, applied in imaging devices, instruments, nuclear engineering, etc., can solve the problem that the above described grating-based setup has a limited dynamic range to phase gradients, and achieve the effect of significantly increasing the dynamic range of phase gradient measuremen

Inactive Publication Date: 2013-11-21
KONINKLJIJKE PHILIPS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to enhance information obtained through phase-contrast imaging. It provides an analyzer grating that dampens the intensity of every other maximum in relation to the preceding maximum. This results in a different periodicity of the signal depending on the X-ray propagation. By changing the transmission of the grating to match G1, a change in intensity pattern can be detected, with different attenuation of maxima. This increases the dynamic range of phase gradient measurements, providing more accurate data.

Problems solved by technology

However, it has been shown that in particular for large objects, the above described grating-based setup has a limited dynamic range to phase gradients.

Method used

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  • Differential phase-contrast imaging with increased dynamic range
  • Differential phase-contrast imaging with increased dynamic range

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Embodiment Construction

[0038]FIG. 1 schematically shows an X-ray imaging system 10 for differential phase-contrast imaging, comprising an X-ray image acquisition device 12 for generating differential phase-contrast images of an object according to one of the embodiments or aspects described below. The X-ray imaging system 10 further comprises a processing unit 14 and an interface unit 16 (not further shown). Further, the X-ray image acquisition device for generating differential phase-contrast images of an object comprises an X-ray source 18 and a detector arrangement 20 which is described with reference to FIG. 2 in the following below.

[0039]A table 22 is provided to receive a subject to be examined. The X-ray source and the detector arrangement 20 are mounted on a C-arm arrangement 24 such that the table 22 can be arranged between the X-ray source 18 and the detector arrangement 20. The C-arm arrangement 24 allows a movement of the X-ray image acquisition device 12 around the patient to be able to adapt...

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Abstract

The present invention relates to X-ray differential phase-contrast imaging. In order to enhance the information acquired by phase-contrast imaging, an analyzer grating (34) for X-ray differential phase-contrast imaging is provided with an absorption structure (48). The latter comprises a first plurality (50) of first areas (52) with a first X-ray attenuation, and a second plurality (54) of second areas (56) with a second X-ray attenuation. The second X-ray attenuation is smaller than the first X-ray attenuation, and the first and second areas are arranged periodically in an alternating manner. A third plurality (58) of third areas (60) is provided with a third X-ray attenuation, which lies in a range from the second X-ray attenuation to the first X-ray attenuation, wherein every second of the first or second areas is replaced by one of the third areas.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an analyzer grating for X-ray differential phase-contrast imaging, a phase grating for X-ray differential phase-contrast imaging, a detector arrangement of an X-ray system, an X-ray image acquisition device, and an X-ray imaging system for differential phase-contrast imaging, and a method for differential phase-contrast imaging as well as a computer program element and a computer-readable medium.BACKGROUND OF THE INVENTION[0002]Differential phase-contrast imaging is used to enhance contrast of low absorbing specimen, compared to conventional amplitude contrast images, for example. In WO 2004 / 071298 A1, an apparatus is provided for generating phase-contrast X-ray image, which comprises, along an optical path, an incoherent X-ray source, a first beam splitter grating, a second beam recombiner grating, an optical analyzer grating and an image detector. In differential phase-contrast imaging, the grating G1, i.e. the so-called...

Claims

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Application Information

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IPC IPC(8): G21K1/06
CPCG21K1/067G21K1/06G21K2201/067G21K2207/005A61B6/0407A61B6/4035A61B6/4078A61B6/4291A61B6/4441A61B6/484A61B6/508
Inventor KOEHLER, THOMASROSSL, EWALD
Owner KONINKLJIJKE PHILIPS NV